Solvent-filled bags

At least two different techniques are available to compress an emulsion at a given osmotic pressure H. One technique consists of introducing the emulsion into a semipermeable dialysis bag and to immerse it into a large reservoir filled with a stressing polymer solution. This latter sets the osmotic pressure H. The permeability of the dialysis membrane is such that only solvent molecules from the continuous phase and surfactant are exchanged across the membrane until the osmotic pressure in the emulsion becomes equal to that of the reservoir. The dialysis bag is then removed and the droplet volume fraction at equilibrium is measured. 

A clean, dry, 100-mL, two-necked, round-bottomed flask is set up with a reflux condenser (air-cooled) in a nitrogen-filled glove bag. To the second neck, a septum is attached. Twenty-five milliliters of freshly-dried THF and 10.5 g (0.04 mol) of triphenylphosphine are added to the flask, which contains a Teflon-coated magnetic stirring bar. Lithium metal (0.55 g, 0.08 mol) from which oil has been cleaned, is scraped, cut, and pressed into flat rods and is added to the THF-phosphine solution. After the solution is stirred, a red color forms which indicates formation of the diphenylphosphide ion. The air-cooled condenser is used because the heat liberated by this reaction causes the solvent to reflux. Within 2 hr the reaction is 85-95% complete, based on unreacted lithium, and the solution is dark-red. It has been observed that the smaller the amount of THF used, the faster the reaction proceeds and the greater is the rate of refluxing. 

In an in situ dialysis technique, a dialysis bag filled with pure solvent is directly immersed into a natural aqueous sample in situ to enrich truly dissolved forms of organic compounds without substantial influence of adsorption on the walls of vessels and apparatus. 

The speciality polyolefin alloys are soft and flexible, halogen-free and plasticizer-free, good contact clarity, sterilizable, heat or radiofrequency sealable, good barrier properties, excellent chemical or solvent resistance, comply wit USP class VI, environmentally safe for disposition, ease of fabrication, and cost effective. Rxloy products, developed by Ferro Corporation, find medical applications in fluid administration, prefilled containers, blood bags, flexible containers, urine collection bags, and dry bags. These applications are from Rxloy FFS (form/fill/seal) and RF (radio fre-... 

---